Assuming that material from a heavy fraction of air classifi

Assuming that material from a heavy fraction of air classified MSW results in the following characteristics. Compute the purity, recovery, and the overall efficiency of the mags. FEED: mags 2000 kg/hr Tails 5000 kg/hr EXTRACT mags 1800 kg/hr Tails 300 kg/hr REJECTS mags 200 kg/hr Tails 4700 kg/hr

Solution

%efficieny =100( Number of mags extracted/ Total number of mags )

%efficieny = 100 (1800/2000)

%efficieny = 90% = 0.9

Purity = 100xUsed mags / feed mags

Purity = 100x1800/2000 = 90%

Recovery = (Number of mags used x purity )x100/(Total number of mags sorted)

Recovery = (1800x0.9x100)/2000 = 81%